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<div class="title">samples/cpp/tutorial_code/Histograms_Matching/MatchTemplate_Demo.cpp</div>  </div>
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<p>An example using Template Matching algorithm</p>
<div class="fragment"><div class="line"></div><div class="line"><span class="preprocessor">#include &quot;<a class="code" href="../../d6/d87/imgcodecs_8hpp.html">opencv2/imgcodecs.hpp</a>&quot;</span></div><div class="line"><span class="preprocessor">#include &quot;<a class="code" href="../../d4/dd5/highgui_8hpp.html">opencv2/highgui.hpp</a>&quot;</span></div><div class="line"><span class="preprocessor">#include &quot;<a class="code" href="../../d1/d4f/imgproc_2include_2opencv2_2imgproc_8hpp.html">opencv2/imgproc.hpp</a>&quot;</span></div><div class="line"><span class="preprocessor">#include &lt;iostream&gt;</span></div><div class="line"></div><div class="line"><span class="keyword">using namespace </span><a class="code" href="../../d8/dcc/namespacestd.html">std</a>;</div><div class="line"><span class="keyword">using namespace </span><a class="code" href="../../d2/d75/namespacecv.html">cv</a>;</div><div class="line"></div><div class="line"><span class="keywordtype">bool</span> use_mask;</div><div class="line"><a name="_a0"></a><a class="code" href="../../d3/d63/classcv_1_1Mat.html">Mat</a> img; <a class="code" href="../../d3/d63/classcv_1_1Mat.html">Mat</a> templ; <a class="code" href="../../d3/d63/classcv_1_1Mat.html">Mat</a> <a name="a1"></a><a class="code" href="../../da/dd3/group__gapi__math.html#gaba076d51941328cb7ca9348b7b535220">mask</a>; <a class="code" href="../../d3/d63/classcv_1_1Mat.html">Mat</a> result;</div><div class="line"><span class="keyword">const</span> <span class="keywordtype">char</span>* image_window = <span class="stringliteral">&quot;Source Image&quot;</span>;</div><div class="line"><span class="keyword">const</span> <span class="keywordtype">char</span>* result_window = <span class="stringliteral">&quot;Result window&quot;</span>;</div><div class="line"></div><div class="line"><span class="keywordtype">int</span> match_method;</div><div class="line"><span class="keywordtype">int</span> max_Trackbar = 5;</div><div class="line"></div><div class="line"><span class="keywordtype">void</span> MatchingMethod( <span class="keywordtype">int</span>, <span class="keywordtype">void</span>* );</div><div class="line"></div><div class="line"><span class="keywordtype">int</span> main( <span class="keywordtype">int</span> argc, <span class="keywordtype">char</span>** argv )</div><div class="line">{</div><div class="line">  <span class="keywordflow">if</span> (argc &lt; 3)</div><div class="line">  {</div><div class="line">    cout &lt;&lt; <span class="stringliteral">&quot;Not enough parameters&quot;</span> &lt;&lt; endl;</div><div class="line">    cout &lt;&lt; <span class="stringliteral">&quot;Usage:\n&quot;</span> &lt;&lt; argv[0] &lt;&lt; <span class="stringliteral">&quot; &lt;image_name&gt; &lt;template_name&gt; [&lt;mask_name&gt;]&quot;</span> &lt;&lt; endl;</div><div class="line">    <span class="keywordflow">return</span> -1;</div><div class="line">  }</div><div class="line"></div><div class="line">  img = <a name="a2"></a><a class="code" href="../../d4/da8/group__imgcodecs.html#ga288b8b3da0892bd651fce07b3bbd3a56">imread</a>( argv[1], <a name="a3"></a><a class="code" href="../../d8/d6a/group__imgcodecs__flags.html#gga61d9b0126a3e57d9277ac48327799c80af660544735200cbe942eea09232eb822">IMREAD_COLOR</a> );</div><div class="line">  templ = <a class="code" href="../../d4/da8/group__imgcodecs.html#ga288b8b3da0892bd651fce07b3bbd3a56">imread</a>( argv[2], <a class="code" href="../../d8/d6a/group__imgcodecs__flags.html#gga61d9b0126a3e57d9277ac48327799c80af660544735200cbe942eea09232eb822">IMREAD_COLOR</a> );</div><div class="line"></div><div class="line">  <span class="keywordflow">if</span>(argc &gt; 3) {</div><div class="line">    use_mask = <span class="keyword">true</span>;</div><div class="line">    mask = <a class="code" href="../../d4/da8/group__imgcodecs.html#ga288b8b3da0892bd651fce07b3bbd3a56">imread</a>( argv[3], <a class="code" href="../../d8/d6a/group__imgcodecs__flags.html#gga61d9b0126a3e57d9277ac48327799c80af660544735200cbe942eea09232eb822">IMREAD_COLOR</a> );</div><div class="line">  }</div><div class="line"></div><div class="line">  <span class="keywordflow">if</span>(img.<a name="a4"></a><a class="code" href="../../d3/d63/classcv_1_1Mat.html#abbec3525a852e77998aba034813fded4">empty</a>() || templ.<a class="code" href="../../d3/d63/classcv_1_1Mat.html#abbec3525a852e77998aba034813fded4">empty</a>() || (use_mask &amp;&amp; mask.<a class="code" href="../../d3/d63/classcv_1_1Mat.html#abbec3525a852e77998aba034813fded4">empty</a>()))</div><div class="line">  {</div><div class="line">    cout &lt;&lt; <span class="stringliteral">&quot;Can&#39;t read one of the images&quot;</span> &lt;&lt; endl;</div><div class="line">    <span class="keywordflow">return</span> EXIT_FAILURE;</div><div class="line">  }</div><div class="line"></div><div class="line">  <a name="a5"></a><a class="code" href="../../d7/dfc/group__highgui.html#ga5afdf8410934fd099df85c75b2e0888b">namedWindow</a>( image_window, <a name="a6"></a><a class="code" href="../../d0/d90/group__highgui__window__flags.html#ggabf7d2c5625bc59ac130287f925557ac3acf621ace7a54954cbac01df27e47228f">WINDOW_AUTOSIZE</a> );</div><div class="line">  <a class="code" href="../../d7/dfc/group__highgui.html#ga5afdf8410934fd099df85c75b2e0888b">namedWindow</a>( result_window, <a class="code" href="../../d0/d90/group__highgui__window__flags.html#ggabf7d2c5625bc59ac130287f925557ac3acf621ace7a54954cbac01df27e47228f">WINDOW_AUTOSIZE</a> );</div><div class="line"></div><div class="line">  <span class="keyword">const</span> <span class="keywordtype">char</span>* trackbar_label = <span class="stringliteral">&quot;Method: \n 0: SQDIFF \n 1: SQDIFF NORMED \n 2: TM CCORR \n 3: TM CCORR NORMED \n 4: TM COEFF \n 5: TM COEFF NORMED&quot;</span>;</div><div class="line">  <a name="a7"></a><a class="code" href="../../d7/dfc/group__highgui.html#gaf78d2155d30b728fc413803745b67a9b">createTrackbar</a>( trackbar_label, image_window, &amp;match_method, max_Trackbar, MatchingMethod );</div><div class="line"></div><div class="line">  MatchingMethod( 0, 0 );</div><div class="line"></div><div class="line">  <a name="a8"></a><a class="code" href="../../d7/dfc/group__highgui.html#ga5628525ad33f52eab17feebcfba38bd7">waitKey</a>(0);</div><div class="line">  <span class="keywordflow">return</span> EXIT_SUCCESS;</div><div class="line">}</div><div class="line"></div><div class="line"><span class="keywordtype">void</span> MatchingMethod( <span class="keywordtype">int</span>, <span class="keywordtype">void</span>* )</div><div class="line">{</div><div class="line">  <a class="code" href="../../d3/d63/classcv_1_1Mat.html">Mat</a> img_display;</div><div class="line">  img.<a name="a9"></a><a class="code" href="../../d3/d63/classcv_1_1Mat.html#a33fd5d125b4c302b0c9aa86980791a77">copyTo</a>( img_display );</div><div class="line"></div><div class="line">  <span class="keywordtype">int</span> result_cols =  img.<a name="a10"></a><a class="code" href="../../d3/d63/classcv_1_1Mat.html#aa3e5a47585c9ef6a0842556739155e3e">cols</a> - templ.<a class="code" href="../../d3/d63/classcv_1_1Mat.html#aa3e5a47585c9ef6a0842556739155e3e">cols</a> + 1;</div><div class="line">  <span class="keywordtype">int</span> result_rows = img.<a name="a11"></a><a class="code" href="../../d3/d63/classcv_1_1Mat.html#abed816466c45234254d25bc59c31245e">rows</a> - templ.<a class="code" href="../../d3/d63/classcv_1_1Mat.html#abed816466c45234254d25bc59c31245e">rows</a> + 1;</div><div class="line"></div><div class="line">  result.<a name="a12"></a><a class="code" href="../../d3/d63/classcv_1_1Mat.html#a55ced2c8d844d683ea9a725c60037ad0">create</a>( result_rows, result_cols, <a name="a13"></a><a class="code" href="../../d1/d1b/group__core__hal__interface.html#ga32ec76240e43e4c9c7b2e2785180a7e6">CV_32FC1</a> );</div><div class="line"></div><div class="line">  <span class="keywordtype">bool</span> method_accepts_mask = (<a name="a14"></a><a class="code" href="../../df/dfb/group__imgproc__object.html#gga3a7850640f1fe1f58fe91a2d7583695dab65c042ed62c9e9e095a1e7e41fe2773">TM_SQDIFF</a> == match_method || match_method == <a name="a15"></a><a class="code" href="../../df/dfb/group__imgproc__object.html#gga3a7850640f1fe1f58fe91a2d7583695daf9c3ab9296f597ea71f056399a5831da">TM_CCORR_NORMED</a>);</div><div class="line">  <span class="keywordflow">if</span> (use_mask &amp;&amp; method_accepts_mask)</div><div class="line">    { <a name="a16"></a><a class="code" href="../../df/dfb/group__imgproc__object.html#ga586ebfb0a7fb604b35a23d85391329be">matchTemplate</a>( img, templ, result, match_method, mask); }</div><div class="line">  <span class="keywordflow">else</span></div><div class="line">    { <a class="code" href="../../df/dfb/group__imgproc__object.html#ga586ebfb0a7fb604b35a23d85391329be">matchTemplate</a>( img, templ, result, match_method); }</div><div class="line"></div><div class="line">  <a name="a17"></a><a class="code" href="../../dc/d84/group__core__basic.html#ga1b6a396a456c8b6c6e4afd8591560d80">normalize</a>( result, result, 0, 1, <a name="a18"></a><a class="code" href="../../d2/de8/group__core__array.html#ggad12cefbcb5291cf958a85b4b67b6149fa9f0c1c342a18114d47b516a88e29822e">NORM_MINMAX</a>, -1, <a class="code" href="../../d3/d63/classcv_1_1Mat.html">Mat</a>() );</div><div class="line"></div><div class="line">  <span class="keywordtype">double</span> minVal; <span class="keywordtype">double</span> maxVal; <a name="_a19"></a><a class="code" href="../../db/d4e/classcv_1_1Point__.html">Point</a> minLoc; <a class="code" href="../../db/d4e/classcv_1_1Point__.html">Point</a> maxLoc;</div><div class="line">  <a class="code" href="../../db/d4e/classcv_1_1Point__.html">Point</a> matchLoc;</div><div class="line"></div><div class="line">  <a name="a20"></a><a class="code" href="../../d2/de8/group__core__array.html#gab473bf2eb6d14ff97e89b355dac20707">minMaxLoc</a>( result, &amp;minVal, &amp;maxVal, &amp;minLoc, &amp;maxLoc, <a class="code" href="../../d3/d63/classcv_1_1Mat.html">Mat</a>() );</div><div class="line"></div><div class="line">  <span class="keywordflow">if</span>( match_method  == <a class="code" href="../../df/dfb/group__imgproc__object.html#gga3a7850640f1fe1f58fe91a2d7583695dab65c042ed62c9e9e095a1e7e41fe2773">TM_SQDIFF</a> || match_method == <a name="a21"></a><a class="code" href="../../df/dfb/group__imgproc__object.html#gga3a7850640f1fe1f58fe91a2d7583695da5382c8f9df87e87cf1e9f9927dc3bc31">TM_SQDIFF_NORMED</a> )</div><div class="line">    { matchLoc = minLoc; }</div><div class="line">  <span class="keywordflow">else</span></div><div class="line">    { matchLoc = maxLoc; }</div><div class="line"></div><div class="line">  <a name="a22"></a><a class="code" href="../../d6/d6e/group__imgproc__draw.html#ga07d2f74cadcf8e305e810ce8eed13bc9">rectangle</a>( img_display, matchLoc, <a name="a23"></a><a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( matchLoc.<a name="a24"></a><a class="code" href="../../db/d4e/classcv_1_1Point__.html#a4c96fa7bdbfe390be5ed356edb274ff3">x</a> + templ.<a class="code" href="../../d3/d63/classcv_1_1Mat.html#aa3e5a47585c9ef6a0842556739155e3e">cols</a> , matchLoc.<a name="a25"></a><a class="code" href="../../db/d4e/classcv_1_1Point__.html#a157337197338ff199e5df1a393022f15">y</a> + templ.<a class="code" href="../../d3/d63/classcv_1_1Mat.html#abed816466c45234254d25bc59c31245e">rows</a> ), Scalar::all(0), 2, 8, 0 );</div><div class="line">  <a class="code" href="../../d6/d6e/group__imgproc__draw.html#ga07d2f74cadcf8e305e810ce8eed13bc9">rectangle</a>( result, matchLoc, <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>( matchLoc.<a class="code" href="../../db/d4e/classcv_1_1Point__.html#a4c96fa7bdbfe390be5ed356edb274ff3">x</a> + templ.<a class="code" href="../../d3/d63/classcv_1_1Mat.html#aa3e5a47585c9ef6a0842556739155e3e">cols</a> , matchLoc.<a class="code" href="../../db/d4e/classcv_1_1Point__.html#a157337197338ff199e5df1a393022f15">y</a> + templ.<a class="code" href="../../d3/d63/classcv_1_1Mat.html#abed816466c45234254d25bc59c31245e">rows</a> ), Scalar::all(0), 2, 8, 0 );</div><div class="line"></div><div class="line">  <a name="a26"></a><a class="code" href="../../d7/dfc/group__highgui.html#ga453d42fe4cb60e5723281a89973ee563">imshow</a>( image_window, img_display );</div><div class="line">  <a class="code" href="../../d7/dfc/group__highgui.html#ga453d42fe4cb60e5723281a89973ee563">imshow</a>( result_window, result );</div><div class="line"></div><div class="line">  <span class="keywordflow">return</span>;</div><div class="line">}</div></div><!-- fragment --> </div><!-- contents -->
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